<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const xxx = 'hehe'
      const obj = {
        name: 'zs',
        [xxx]: 123, // ['hehe']:123
      }

      const obj1 = {
        0: 'a',
        1: 'b',
        length: 2,
      }
    </script>
  </body>
</html>
